# Dolomite CaMg (CO3) 2 has the largest mass fraction of element 1) oxygen 2) carbon 3) magnesium 4) calcium

June 30, 2021 | education

| Let us determine the mass fraction of each element in the following compound: CaMg (CO3) 2.

First, we find the molar mass of the entire compound.

M (CaMg (CO3) 2) = 40 + 24 + (12 + 16 * 3) * 2 = 64 + 60 * 2 = 64 + 120 = 184 g / mol

Let’s determine the mass fraction of calcium.

M (Ca) = 40 g / mol.

W (Ca) = 40/184 * 100% = 21.7%.

Let’s determine the mass fraction of magnesium.

M (Mg) = 24 g / mol

W (Mg) = 24/184 * 100% = 13%.

Let’s determine the mass fraction of carbon.

M (C) = 12 * 2 = 24 g / mol

W (C) = 24/184 * 100% = 13%.

Determine the mass fraction of oxygen.

M (O2) = 3 * 16 * 2 = 96 g / mol

W (O2) = 96/184 * 100% = 52.2%

This means that oxygen has the largest mass fraction.

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